package cn.tedu._05weibo.commen.Interceptors;

import cn.tedu._05weibo.pojo.vo.UserVO;
import lombok.extern.slf4j.Slf4j;
import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
@Slf4j
public class UserLoginInterceptor implements HandlerInterceptor {
    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        /**
         * 登录状态校验:使用拦截器方式实现;
         * 1.获取会话对象session;
         * 2.利用session获取userVO;
         * 3.判断userVO是否为空值:
         *  3.1为空:重定向到登录页面login.html , return false;
         *  3.2非空:return true
         */
        //打印日志
        log.debug("通过拦截器实现登录状态的校验");
        HttpSession session = request.getSession();
        UserVO userVO = (UserVO) session.getAttribute("user");
        if(userVO==null){
             response.sendRedirect("/login.html");
             return false;
        }
        return true;
    }

    @Override
    public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {
        HandlerInterceptor.super.postHandle(request, response, handler, modelAndView);
    }

    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {
        HandlerInterceptor.super.afterCompletion(request, response, handler, ex);
    }
}
